lologopro5479 lologopro5479

21-06-2018
Biology

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"runner's high" occurs when prolonged, intense athletic activity causes the release of _____, the brain's natural painkiller.

Relax

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lilfir3fight3rp8krgu lilfir3fight3rp8krgu

21-06-2018

The brain releases endorphins as a natural pain killer.

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